Michigan's Public Safety Communications System (MPSCS) Radio ID Structure
From The RadioReference Wiki
All radios of the MPSCS poses a 7 digit radio ID number following a standard format as shown below.
XYYZZZZ
X is the Zone Number
YY is the County Number. If the radio is a dispatch console then 00 is displayed.
ZZZZ is the individual radio ID. Odd numbers are mobile radios. Even numbers are portable radios.
This section can also be broken down even further.
0001-2999 - state agencies
3000-8999 - county and local agencies (County Sheriff Departments, Fire Departments, Local Police Departments, Public Works, etc)
9000-9800 - federal agencies
9900-9999 - base stations
Some Examples
2001051 is a dispatch console
2620080 is a portable radio used by a state agency in Oakland County
2473151 is a mobile radio used by a county or local agency in Livingston County
1359989 is a base station used by an agency in Iosco County